Revert "chore: remove unused monkeypatch file" (it was not unused)

This reverts commit 8fe421f.

Author: TimothyJones

test/monkeypatch.rb

@@ -0,0 +1,6 @@
+def Filelock(lockname, options = {}, &block)
+  puts "Opening file without filelock"
+  File.open(lockname, File::RDWR|File::CREAT, 0644) do |file|
+    Timeout::timeout(options.fetch(:timeout, 60), Filelock::ExecTimeout) { yield file }
+  end
+end